Throw-out feed-lift mechanism for sewing machines



Sept. 27, 1932. H J GQOSMAN 1,879,190

THROW-OUT FEED LIFT MECHANISM FOR SEWING MACHINES Filed May 22, 1931gmw/nhw Herbefz J G'oosman Patented Sept. 27, 1932 UNITED STATES PATENTOFFICE HERBERT J'. GOOSMAN, OF ELIZABETH, NEW] JERSEY, ASSIGNOR TO THESINGER MANU- FACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATIONOF NEW JERSEY THROW-OUT FEED-LIFT MECHANISM FOR SEWING MACHINESApplication filed May 22, 1931. Serial No. 539,158.

For certain operations with household sewing machines, such asembroidering and darning operations, it is desirable to render the usualfour-motion feed-dog inefiective so I that it will not engage the work.This has heretofore been done in various ways including a provision foruncoupling the feed-bar lifting arm from its actuating rock-shaft.

The present improvement has for an object 10 to provide a simplifiedmeans for efiecting the disconnection of the feed-bar from the feedliftmechanism for embroidering and darning operations or the like.

A further object of the invention is to pro- 1 vide for the secureclamping of the shiftable parts of the mechanism in working position orin disconnected position, to avoid the evils of lost-motion andaccidental displacement of the parts.

a The invention comprises the devices, combinations and relativearrangements of parts hereinafter described and claimed.

The features of the invention and the advantages attained thereby willbe readily understood by those skilled in the art from the followingdetailed description of a preferred embodiment of the inventionillustrated in the accompanying drawing in which Fig. 1 is a transversevertical section through the bedplate of a sewing machine, showing. thefeedbar and associated parts in elevation. Fig. 2 is a bottom plan viewof the parts. Fig. 3 is a section on the line 3-8, Fig. 1. Fig. 4 is asection on the line 44, Fig. 1, and Fig. 5 is a disassembled perspectiveview of the feed-lift arm and parts carried thereby.

1 represents the sewing machine bed below which is mounted, in the usualmanner, the feed-advancing rock-shaft 2 and feed-lift rock-shaft 3. Thefeed-advancing rock-shaft 2 is formed with the usual spaced upstandingarms 4, 4 carrying the pintles 5, 5 which pivotally support thetransversely extending rearward end-portion 6 of the feed-bar 7 carryingthe usual four-motion feed-dog 8. The feed-dog 8 works (through theusual slotted throat-plate 9 the upper surface of which is substantiallyflush with the bed or cloth-plate 1 of the machine and is formed 50 withthe usual hole 10 through which the reciprocating needle (not shown)descends for cooperation with the oscillatory shuttle 11 or othersuitable loop-taker. The feed-lift rockshaft 3 has fixed to it thefeed-lift arm 12 formed at. its rearward free end with an aper-' ture 13parallel to the axis -of the shaft 3.

The arm 12 is also formed with a slot 14 opening into one side of thewall of the aperture 13. v i

There is mounted in the aperture 13 of the arm 12 a slide-bolt 15carrying at one end an anti-friction roller 16 adapted to enter the slot17 in the forwardly disposed forked end of the feed-bar 7. The manuallyoperated clampin screw 18 has its shank passed through the slot 14 inthe arm 12 and is threaded into the slide-bolt 15 so that the screw 18may be tightened to clamp the slide bolt 15 firmly to the arm 12 withthe roller 16 in the slot- 17 in the feed-bar.

When it is desired to use the sewing machine for embroidering or likeoperations, the operator loosens the screw 18 and shifts it to the otherend of the slot 14, thereby sliding the bolt 15 from full line position,Fig. 2, to'* dotted line position, in which the roller 16 isdisconnected from and is entirely out of engagement with the slotted endof the feedbar 7 The clamping screw 18 is securely tightened in itsdotted line position, Fig. 2, 7

thereby avoiding accidental reengagement of the slide-bolt 15 with thefeed-bar 7 When the feed-lift roller 16 is disconnected from thefeed-bar, the latter drops to dotted line position, Fig. 1, andreciprocates idly in such-' position; the feed-dog resting upon the topof the shuttle race 19 with the feed-dog teeth well below the uppersurface of the throat-plate 9.

Reconnection of the feed-lift mechanism for regular straightaway sewingoperations is readily effected by restoring the slide-bolt 15 fromdotted line to full line position, Fig.

chines, the combination with a feed-bar having a slotted end, means forimparting feedand-return movements to said feed-bar, and means forimparting rising and falling move- 5 ments to said feed-bar, said lastmentioned means including a rock-shaft, a feed-lift arm fixed to saidrock-shaft, and a coupling ele-. ment carried by and shiftable relativeto said feed-lift arm into and out of direct working Engagement with theslotted end of said feed- 2. In feeding mechanism for sewing machines,the combination with a feed-bar having a slotted end, means forimparting feedand-return movements to said feed-bar, and

means for imparting rising and falling movements to said feed-bar, saidlast mentioned means including a rock-shaft, a feed-lift arm fixed tosaid rock-shaft, a coupling element carried by and shiftable relative tosaid feed- Vlift arm into and out of working engagement with the slottedend of said feed-bar, and means for clamping said element to saidfeedlift arm in either engaged or disengaged position relative to saidfeed-bar.

3. In feeding mechanism for sewing machines, the combination with afeed-bar, means for imparting feed-and-return movements to saidfeed-bar, and means for imparting rising and falling movements to saidfeed-bar, said last mentioned means including a rock-shaft, a feed-liftarm fixed to said rock-shaft and formed with an aperture parallel to theaxis of said rock-shaft and with a slot in the side wall of saidaperture, a slidebolt mounted in said aperture for endwise movement tocarry one end of such bolt into or out of engagement with said feed-bar,and a clampscrew passing through said slot and threaded into saidslide-bolt for clamping the latter to said feed-lift arm in eitherengaged or disengaged position relative to said feedbar. 7

In testimony whereof I have signed my name to this specification.

HERBERT J. GOOSMAN.

